兰州石化乙烯装置钢框架的抗火极限安全分析  

Fire resistance limit and safety analysis of steel frames in Lanzhou Petrochemical Ethylene Plant

作　　者：张荣钢[1] 张宏涛[2] 白玉星[3] 张素枝[1] 高建岭[3] 颜聪枝 徐秉业[4] 王晓纯[3] 

机构地区：[1]中国寰球工程公司,北京100029 [2]北京科技大学土木工程系,北京100083 [3]北方工业大学土木工程系,北京100144 [4]清华大学工程力学系,北京100084

出　　处：《建筑结构学报》2007年第S1期136-141,共6页Journal of Building Structures

摘　　要：针对目前石化建筑结构采用的传统"处方法"防火设计,存在着有时设防过度造成浪费,有时又设防不足造成不安全的情况,应用基于塑性极限上限分析,利用基本破坏机构迭加的方法,通过非线性规划求解,寻找内力功最小值对应的破坏机构,考虑火灾时材料强度降低的非线性特征和弹性模量的不断减小,采用迭代法确定结构的耐火极限时间。用编制的钢框架计算程序,对兰州石化乙烯装置钢框架管廊整体结构进行了抗火验算和性能化设计。提出了主体结构的概念和上限钢框架整体结构抗火验算的实用设计方法,研究了烃类火荷载取值,对烃类火灾结构温度场进行了模拟,通过计算确定了装置内不同区域钢框架结构的保护范围,保证了事故火灾时整体结构的抗火安全性,同时取得了较好的经济效果。Regarding prescriptive method in fire design for petrochemical structure,it could in high cost of construction and unsafety sometime.Based on the upper bound theorem,using the combination of element collapse mechanisms of steel frames and looking for one of minimal internal force work,considering both strength and modulus reduced,applying iterative,the fire resistance limit calculated.Analysis program is formulated and to be used in petrochemical ethylene plant equipments,which solved by nonlinear mathematical programming and performance design method.Suggesting concept of main structure for fire resistance structure design and simulating fire situation of hydrocarbon,the protection field is determined by calculation and the practical design method is proposed for the fire proof of steel frames.

关 键 词：钢框架 塑性极限 抗火设计 耐火保护 

分 类 号：TU391[建筑科学—结构工程]